/*背景图*/
.a_background {
  width: 100%;
  height: 100%;
  position: absolute;
}
.a_background_top {
  width: 100%;
  height: 71.6%;
  background-image: url("http://img.mukewang.com/55addf6900019d8f14410645.png");
  background-size: 100% 100%;
}
.a_background_middle {
  width: 100%;
  height: 13.1%;
  background-image: url("http://img.mukewang.com/55addf800001ff2e14410118.png");
  background-size: 100% 100%;
}
.a_background_botton {
  width: 100%;
  height: 15.3%;
  background-image: url("http://img.mukewang.com/55addfcb000189b314410138.png");
  background-size: 100% 100%;
}